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These are two debugger extensions that are used to see the PDB file that matches a specific module.
Note that !itoldyouso is not documented. The output of both commands is identical.
Usage:
0:025> !chksym ntdll
ntdll.dll
Timestamp: 49EEA706
SizeOfImage: 180000
pdb: wntdll.pdb
pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95
age: 2
Loaded pdb is c:\publicsymbols\wntdll.pdb\E06BEA155E9748BEA818E2D0DD2FED952\wntdll.pdb
wntdll.pdb
pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95
age: 2
MATCH: wntdll.pdb and ntdll.dll
0:025> !itoldyouso ntdll
ntdll.dll
Timestamp: 49EEA706
SizeOfImage: 180000
pdb: wntdll.pdb
pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95
age: 2
Loaded pdb is c:\publicsymbols\wntdll.pdb\E06BEA155E9748BEA818E2D0DD2FED952\wntdll.pdb
wntdll.pdb
pdb sig: E06BEA15-5E97-48BE-A818-E2D0DD2FED95
age: 2
MATCH: wntdll.pdb and ntdll.dll
0:025> !chksym mtgdi
mtgdi.exe
Timestamp: 48785A80
SizeOfImage: 27000
pdb: c:\DOWNLOADS\mtgdi\Debug\mtgdi.pdb
pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9
age: 3
Loaded pdb is C:\development\My Tools\Book\mtgdi\Debug\mtgdi.pdb
mtgdi.pdb
pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9
age: 3
MATCH: mtgdi.pdb and mtgdi.exe
0:025> !itoldyouso mtgdi
mtgdi.exe
Timestamp: 48785A80
SizeOfImage: 27000
pdb: c:\DOWNLOADS\mtgdi\Debug\mtgdi.pdb
pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9
age: 3
Loaded pdb is C:\development\My Tools\Book\mtgdi\Debug\mtgdi.pdb
mtgdi.pdb
pdb sig: EC1B3DB2-25C1-4337-8676-DFB3C5B1C8C9
age: 3
MATCH: mtgdi.pdb and mtgdi.exe